From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/c/numeric%2Fmath%2Ftrunc.html | 57 +++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 devdocs/c/numeric%2Fmath%2Ftrunc.html (limited to 'devdocs/c/numeric%2Fmath%2Ftrunc.html') diff --git a/devdocs/c/numeric%2Fmath%2Ftrunc.html b/devdocs/c/numeric%2Fmath%2Ftrunc.html new file mode 100644 index 00000000..a86f0ec6 --- /dev/null +++ b/devdocs/c/numeric%2Fmath%2Ftrunc.html @@ -0,0 +1,57 @@ +

trunc, truncf, truncl

Defined in header <math.h> 
float       truncf( float arg );
+		 (1) (since C99) 
double      trunc( double arg );
+		 (2) (since C99) 
long double truncl( long double arg );
+		 (3) (since C99)
Defined in header <tgmath.h> 
#define trunc( arg )
+		 (4) (since C99)
+1-3) Computes the nearest integer not greater in magnitude than arg.
+4) Type-generic macro: If arg has type long double, truncl is called. Otherwise, if arg has integer type or the type double, trunc is called. Otherwise, truncf is called.

Parameters

+ +
arg - floating point value

Return value

If no errors occur, the nearest integer value not greater in magnitude than arg (in other words, arg rounded towards zero), is returned.

+
Return value
math-trunc.svg
Argument

Error handling

Errors are reported as specified in math_errhandling.

+

If the implementation supports IEEE floating-point arithmetic (IEC 60559),

+

Notes

FE_INEXACT may be (but isn't required to be) raised when truncating a non-integer finite value.

+

The largest representable floating-point values are exact integers in all standard floating-point formats, so this function never overflows on its own; however the result may overflow any integer type (including intmax_t), when stored in an integer variable.

+

The implicit conversion from floating-point to integral types also rounds towards zero, but is limited to the values that can be represented by the target type.

+

Example

#include <math.h>
+#include <stdio.h>
+int main(void)
+{
+    printf("trunc(+2.7) = %+.1f\n", trunc(2.7));
+    printf("trunc(-2.7) = %+.1f\n", trunc(-2.7));
+    printf("trunc(-0.0) = %+.1f\n", trunc(-0.0));
+    printf("trunc(-Inf) = %+f\n",   trunc(-INFINITY));
+}

Possible output:

+
trunc(+2.7) = +2.0
+trunc(-2.7) = -2.0
+trunc(-0.0) = -0.0
+trunc(-Inf) = -inf

References

See also

+ + + +
+
(C99)(C99)
 computes largest integer not greater than the given value
(function)
+
(C99)(C99)
 computes smallest integer not less than the given value
(function)
+
(C99)(C99)(C99)(C99)(C99)(C99)(C99)(C99)(C99)
 rounds to nearest integer, rounding away from zero in halfway cases
(function)
C++ documentation for trunc
+

+ © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
+ https://en.cppreference.com/w/c/numeric/math/trunc +

+
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